QNAP NAS Error Code 35: How to Fix DNS Resolution Failed

Easy 15-30 minutes Medium Severity Verified June 2026
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Error Code
35
Brand
QNAP
Product Type
nas
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
15-30 minutes
Error code 35 on your QNAP NAS indicates that the device is unable to resolve DNS addresses. This usually happens due to incorrect DNS settings, network configuration issues, or a temporary glitch preventing your NAS from connecting to the internet or local network services.
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Tools You'll Need

How to Fix Error Code 35

  1. Check Network Connectivity

  2. Restart Your Router and NAS

  3. Check DNS Settings on the NAS

    Changing DNS settings may affect network performance; use reliable DNS servers.

  4. Flush DNS Cache (SSH Method)

    SSH access requires administrator credentials. Be careful with command-line operations.

  5. Update Network Adapter Driver (Firmware)

    Ensure your NAS is on a stable power source during firmware update to avoid corruption.
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When to Call a Professional

If the error persists after trying all steps, your NAS may have a hardware issue with the network port or a corrupted system partition. Contact QNAP support or a professional IT technician for further diagnosis.

Frequently Asked Questions

What does QNAP error code 35 mean?
Error code 35 means your QNAP NAS cannot resolve DNS addresses, preventing it from accessing the internet or network services by hostname.
How do I fix DNS resolution failed on QNAP?
Start by checking network connections and restarting your router and NAS. Then manually set DNS servers (like 8.8.8.8) in the NAS network settings. Flushing the DNS cache via SSH or updating firmware may also help.
Can a router restart fix QNAP error 35?
Yes, restarting your router can resolve temporary network issues that cause DNS resolution failure. Try restarting both the router and the NAS.
What DNS servers should I use for QNAP?
Reliable public DNS servers include Google DNS (8.8.8.8 and 8.8.4.4), Cloudflare (1.1.1.1 and 1.0.0.1), or your ISP's DNS. Using Google DNS is often recommended for stability.
Error 35 still appears after changing DNS settings. What next?
If the error persists, try flushing the DNS cache via SSH or updating the NAS firmware. If that doesn't work, your network adapter may have a hardware problem – contact QNAP support.

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